Electric pump.



UNITED STATES Patented November 10, 1903.

OTTO G. DOBERT, OF NEW YORK, N. Y.

ELECTREC PUMP.

SPECIFICATION forming part of Letters Patent No. 743,836, dated November10, 1903. Application filed July 17,1903. Serial No. 165,955. (Nomodel.)

T0 and whom, it flea/y concern:

Be it known that I, OTTO G. DOBERT, a citizen of the United States, anda resident of the city of New York, borough of Brooklyn, in the countyof Kings and State of New York,

have invented a new and Improved Electric Pump, of which the followingis a full, clear, and exact description.

My invention relates to electric pumps, my more particular object beingto produce a type of electric motor and connections therefor so as torender the same suitable for operating a reciprocating pump.

My invention may be used upon new machinery, but is also particularlyadapted for service in supplanting steam machinery with electricmachinery without disturbing a reciprocating pump already in use.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in both the figures.

Figure 1 is a side elevation, partly in section, showing my invention inuse; and Fig. 2 is a diagram of the wiring.

Upon a base 1 is mounted a reciprocating pump 2, provided with a piston3 and a stuffing-box 4, these parts being of the usual or any desiredtype. Connected with the piston 3 is a piston-rod 5, which is slidablymounted in bearings 6 and is provided with a head 7, this head beingprovided with an aperture 8 of the shape indicated in Fig. 1. A motor 9is provided with an armature 9, and to this armature is rigidlyconnected a radial arm 10. Pivoted upon this arm is a pitman 11, whichis connected with a depending arm 12 of a cross-head 13. Passing throughthis cross-head 13 is a sliding rod 14,- mounted in bearings 15, 16, and17. Uponone end of the rod 14 is a pivot 18, which engages a slot 18 inthe lower end of the switcharm 26. A switchboard 19 is provided withcontact-buttons 20 21 22 and with pivots 23 24. An insulating-link 25connects the switcharms 26 27, so that the latter are free to rock uponthe pivots 23 24. A supply-wire 28 is connected with the pivot 24, andfrom, the switch-button 22 a wire 29 is connected with a wire 30, whichis. in turn connected with the switch-button 20.

At 31 is arheostat for the purpose of regulating the current, saidrheostat being connected by a wire 32 with a brush 33, which brush,together with a brush 35, engages sectors 34 of the armature 9". Fromthe brush 35 a wire 36 leads to the contact-button 21. From the pivot 23of the switch-arm 26 a wire 37 leads to the field 3S, towhich isconnected a supply-wire 39.' The supply-wires 28 39 therefore constitutethe terminals of the electric motor.

Myinvention is used as follows: The motor and pump being connected, asindicated in Fig. 1, the current passes serially through the field 38,wire 37, switch-arm 26, contactbutton 21, wire 36, brush 35, armature 9,brush 33, wire 32, rheostat 31, wire 30, wire 29, switch-arm 27, andwire 28. This causes the armature 9 to rock in a contraclockwisedirection from the view point of Fig. 1. This carries the piston 3 andthe armlO to the right. Just before reaching the end of the stroke thecross-head .13 engages the hearing 16 and causes the rod 14 to travelabruptly to the right. By this means the pole-changer, comprising thearms 26 27, engages the respective buttons 20 21. Owing to the momentumof the rocking armature the movement of the polechanger is renderedcomplete before the armature comes to a seat of rest. The pole-changerbeing reversed, the course of the current is as follows: wire 39, field38, wire 37, arm 26, wire 30, rheostat 31, wire 32, brush 33, armature 9brush 35, wire 36, switch-arm 27, and Wire 28. This again reverses thedirection of movement of the armature, causing it to rock back into theposition indicatedin Fig.1. The motion of the armature thereforecontinually reverses the direction of the current passing through thearmature and maintains the direction of the current passing through thefield. This causes the armature to rock back and forth incessantly,thereby operating the reciprocating pump.

It will be noted that the piston 3 is always in step with the rockingmotion of the arma ture. It will also be noted that the polechangermaintains a fixed position infull engagement with two of the contacts'immedi* ately before the piston reaches the end of its stroke,whereupon the pole changer is reversed suddenly and is left in completeengagement with the appropriate contact-button. By this arrangementsparking is reduced to a minimum.

As above stated, my pump is peculiarly adapted for use where it may bedesirable to remove a stationary engine and to employ instead anelectric motor, so as not to disturb the reciprocating pump where suchhas been used in connection with a reciprocating engine.

Having thus described, my invention, I claim as new and desire to secureby Letters Patent- 1. In an electric pump, the combination of aswitchboard provided with contacts, a polechanger mounted thereon, anelectric motor provided with a rocking armature, the move ments of whichare controllable by movements of the pole-changer, a reciprocating pumpconnected with said rocking armature and free to move in step therewithwhen actuated, and mechanism controllable automatically by movements ofsaid armature for reversing said pole-changer.

2. In an electric pump, the combination of a switchboard provided withcontact-buttons, a pole-changer mounted upon said switchboard and freeto engage said contact-buttons, a sliding rod connected with saidpolechanger and provided with limiting-stops, a cross-head engaging saidsliding rod and free to engage said limiting-stops one at a time, forthe purpose of sliding said rod, a rocking armature provided with aradially-movable arm, means for connecting said radially-movable armwith said cross-head, and a motorcircuit connected with contact-buttons,the arrangement being such that in any part of said motor-circuit thecurrent is reversed by movements of said pole-changer. I

3. In an electric pump, the combination of a switchboard provided withcontacts, a polechanger mounted upon said switchboard, an electric motorprovided with a rocking armature, the movements of which are controlledby said pole-changer, a rocking shaft for supporting said armature, aradial arm connected with said shaft, a reciprocating pump c011- nectedwith said radial arm, a pitman connected with said radial arm andactuated by the movements thereof, a cross-head provided with a portionengaging said pitman, a sliding rod connected with said cross-head andmovable thereby, and mechanism'connecting said sliding rod with saidpole-changer.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

' OTTO G. DOBERT.

Vitnesses:

WILLIAM ScHorzE, CHARLES MUELLER.

